Bi-functional acrylates that have a disulfide bond in their chemical structures were designed and synthesized, for radical UV curing. Reaction behavior and the chemical state of the acrylates were examined by FT-IR, XPS, and Raman spectral measurements, indicating both adequate consumption of acryloyl groups and presence of disulfide bonds after curing. A free-standing film fabricated with the acrylates had its glass transition temperature (Tg) at 49 degree C. The film was shrunk after radical UV curing, while the shrinkage was relieved completely with heating above Tg (60 degree C), due to disulfide-disulfide exchange reactions as well as thermal softening of the polymer cross-linked network. A control sample without disulfide bonds, having almost the same Tg, did not relieve its shrinkage after the same treatment.

Radical UV-cured materials containing disulfide bonds and their physical properties

256th National Meeting (2018)

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